Credit: The Associated Press

Baltimore Orioles second baseman Jonathan Schoop moves under a pop up by Detroit Tigers' Miguel Cabrera for the out during the first inning of a baseball game, Monday, May 12, 2014, in Baltimore. (AP Photo/Nick Wass)

BALTIMORE — Rick Porcello won his fifth straight start, and the Detroit Tigers beat the Baltimore Orioles 4-1 Monday night in a duel between AL division leaders that included a bench-clearing fray.

After Ian Kinsler's two-run homer in the eighth made it 4-1, Orioles starter Bud Norris hit Torii Hunter in the ribcage with a pitch.

Hunter yelled at Norris, and as he made his way toward first base, the Tigers outfielder moved slightly in the direction of the mound. That caused both dugouts to empty, and relievers from both bullpens charged toward the infield.